Malicious PDF — malware analysis report

Static analysis result for SHA-256 984b76708c22518b…

MALICIOUS

PDF

92.7 KB Created: 2021-07-28 02:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e292bfab5c2002aa89381c890ee853c6 SHA-1: 7bd77e78294a1694b2ef5a93495328af42d042d6 SHA-256: 984b76708c22518bb2d3295e95494b5c54ca2b6c87beb5588793f30c771fae95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609db3b2b61bf---20832682184.pdf In PDF document text
    • https://mayurherbal.com/userfiles/file/loxonowex.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/85391088650.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c15dc8a313---49808865225.pdfIn PDF document text
    • https://www.upperhousedev7.com/ckfinder/userfiles/files/ruzoravoxiwewupekix.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f589c204a---95527557154.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f9973c4c9---42067520893.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/0e94faa373387d18e014912e0397c8b7/pelekolojo.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/33201568914.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/wevusikotisudesemasud.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/jipanobapunuzokusupos.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/94637239392.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/98u2stlsv7ce222qr5smlkd516/46620895813.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/puxolepuxomutuzonu.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/konoj.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/63178795613.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/jojajigukegutotuwove.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/84134648741.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d283d8b187---58229572379.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/cc904f8ef4f74e84365e814ddd90d176/86580628694.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae7dec1c06---24384183834.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/4b967t6n7nq1rvgo49pob8hfq3/5015030515.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/28fc75d485e1e10efb54e57e396cd76f/gewaxubavo.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/29453881680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=differences+between+neoclassicism+and+romanticism+artPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 17412 bytes
SHA-256: aaecbc00c771bdb3c576486c7a47389d7ae6cf519a84ccb223118178f9b9ecd6
font_01_sfnt_off00013222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A39 10864 bytes
SHA-256: 91386a1c207d2574d7c00653452c8e5ff9f18beffeb0ace90a3cfce0615085ea

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